Why my windows does not detect 8gb ram its only detect 4gb ram?

[Muhamad Mustaqim Hashim]

Why does my my windows only detect 4gb ram? but i already install 8gb ram. Windows only shows 4gb

my cpu-z detect 8gb

How can this happen? please help me guys!!! does this affect my pc performance? if this affect my pc performance? what should i do?

My spec before
AMD A8 5600K
MSI FM2 A55M E35
4GB RAM KV1600R
WD 500GB
WINDOWS ULTIMATE 64BIT

My latest spec
AMD A8 5600K
MSI FM2 A55M E35
8GB RAM (4GB KV1600R + KV1600R)
WD 500GB + WD 1TB
WINDOWS ULTIMATE 64BIT
MSI R7 260X OC VERSION

 

[Phillip Corcoran]

Check that the RAM modules are inserted fully and properly, and are locked in to place with the end-clips.

 

[Muhamad Mustaqim Hashim]

Check that the RAM modules are inserted fully and properly, and are locked in to place with the end-clips.

im double check it, now i use new motherboard MSI A88X-G45 GAMING LIMITED EDITION, but still facing the same problem, my windows now detect 8gbs, but usable only 4gbs, why? can you help me?

 

[James Mason]

Check this out: http://helpdeskgeek.com/windows-7/fix-the-maximum-amount-of-memory-usable-by-windows-7-64-bit/

 

[Muhamad Mustaqim Hashim]

Check this out: http://helpdeskgeek.com/windows-7/fix-the-maximum-amount-of-memory-usable-by-windows-7-64-bit/

i already done this thing... yeah its detect 8gbs, but in computer information said 8gbs (3.94gb only usable) why does this happen? i thought my motherboard broken and i got the new one but still im facing the same problem... can you help me plz.... i dont sleep for 2 days now because try to fixing this....

 

[James Mason]

Oooh.... you bought your ram as two separate sticks at separate times...
That might be a problem, you bought two single channel ram sticks, you need a dual channel ram set like one of these:
http://pcpartpicker.com/parts/memory/#s=301600&Z=8192002&sort=a10

 

[James Mason]

Actually I think i figured out what it was, because my laptop is doing the same thing. I believe what's happening is because you previously were using onboard graphics, your computer was dedicating part of your ram to the graphics chip in your processor. Now that you have a graphics card, you need to go into the BIOS and tell it to not share RAM with the onboard graphics chip. This will very by what type of BIOS you have but you should be able to look that up.

 

[Muhamad Mustaqim Hashim]

Actually I think i figured out what it was, because my laptop is doing the same thing. I believe what's happening is because you previously were using onboard graphics, your computer was dedicating part of your ram to the graphics chip in your processor. Now that you have a graphics card, you need to go into the BIOS and tell it to not share RAM with the onboard graphics chip. This will very by what type of BIOS you have but you should be able to look that up.

thx dude, im finally settle it, i go to bios and flash it with the new bios update... poof now its my ram usable is 7.2gbs thx guys for helped me